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$132+ Cheap flights from Luis Munoz Marin Intl (SJU) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Mar 15 — Mar 221
Sun 3/15
Sun 3/22
1 adult, Economy
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Cheap flight deals from Luis Munoz Marin Intl to Ontario

Cheapest flights from Luis Munoz Marin Intl to Ontario
Explore the most affordable flight options available from Luis Munoz Marin Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 13, 2026.

This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/295:35 am
SJU
-
ONT
1 stop12h 40m
Southwest
Mon 6/229:40 am
ONT
-
SJU
1 stop11h 45m
Southwest
Deal found 2/11$342
This United Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/202:55 pm
SJU
-
ONT
1 stop9h 26m
United Airlines
Mon 11/27:00 am
ONT
-
SJU
1 stop10h 00m
United Airlines
Deal found 2/12$384
This eDestinos deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/264:11 pm
SJU
-
ONT
2 stops32h 37m
Frontier
Mon 3/26:43 pm
ONT
-
SJU
2 stops16h 23m
Frontier
Deal found 2/11$396
This eDestinos deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/287:05 am
SJU
-
ONT
2 stops20h 54m
Frontier
Wed 3/47:17 pm
ONT
-
SJU
2 stops27h 36m
Frontier
Deal found 2/11$401
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:33 am
SJU
-
ONT
1 stop15h 09m
American Airlines
Mon 3/27:05 pm
ONT
-
SJU
2 stops12h 51m
American Airlines
Deal found 2/12$410
This American Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/2812:39 am
SJU
-
ONT
2 stops14h 28m
American Airlines
Wed 8/1211:59 pm
ONT
-
SJU
2 stops13h 00m
American Airlines
Deal found 2/10$479
This Southwest deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/275:05 am
SJU
-
ONT
1 stop14h 15m
Southwest
Wed 6/109:55 am
ONT
-
SJU
2 stops11h 20m
Southwest
Deal found 2/10$486
This United Airlines deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:00 am
SJU
-
ONT
2 stops13h 47m
United Airlines
Mon 4/275:10 am
ONT
-
SJU
1 stop9h 28m
United Airlines
Deal found 2/10$494

Find flight deals from Luis Munoz Marin Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Luis Munoz Marin Intl (SJU) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$342
(Southwest)

One-way from

$132
(Kiwi.com)

Popular in

April

Cheapest in

January

Average price

$461
Provider with most accurate pricing for San Juan Luis Munoz Marin Intl-Ontario flight deals.
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Provider most trusted by Cheapflights users for San Juan Luis Munoz Marin Intl-Ontario flights.
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From San Juan Luis Munoz Marin Intl to Ontario
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One-way flight from San Juan Luis Munoz Marin Intl to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($61 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in February 2026
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Luis Munoz Marin Intl to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 13, 2026.
Use the filters below to find and compare flights from San Juan Luis Munoz Marin Intl Airport to Ontario that are best for you.

Fly from

Luis Munoz Marin Intl

Fly to

Ontario

Route

Depart

Return

Price

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 5/29

5:35 am-3:15 pm

1 stop12h 40m

Ontario

Mon 6/22

9:40 am-12:25 am

1 stop11h 45m

$342

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 2/26

4:11 pm-8:48 pm

2 stops32h 37m

Ontario

Mon 3/2

6:43 pm-3:06 pm

2 stops16h 23m

$396

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 2/26

7:33 am-10:29 pm

1 stop18h 56m

Ontario

Mon 3/2

7:05 pm-10:00 am

2 stops10h 55m

$420

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 5/27

5:05 am-4:20 pm

1 stop14h 15m

Ontario

Wed 6/10

9:55 am-12:15 am

2 stops11h 20m

$486

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 4/22

7:00 am-5:47 pm

2 stops13h 47m

Ontario

Mon 4/27

5:10 am-5:38 pm

1 stop9h 28m

$494

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 5/27

1:50 pm-10:09 pm

1 stop11h 19m

Ontario

Wed 6/10

11:25 pm-1:47 pm

1 stop11h 22m

$505

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 7/29

5:00 am-12:05 pm

1 stop10h 05m

Ontario

Wed 8/12

6:50 am-10:00 pm

2 stops12h 10m

$512

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Mon 2/23

3:46 pm-10:00 pm

1 stop10h 14m

Ontario

Sat 2/28

1:45 pm-6:11 am

2 stops12h 26m

$530

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 4/21

2:55 pm-9:50 pm

1 stop9h 55m

Ontario

Tue 4/28

5:10 am-5:38 pm

1 stop9h 28m

$561

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Tue 3/3

2:59 am-11:59 pm

3 stops49h 00m

$145

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

Showing 1-10 of 20 results
1
2

Compare providers for flights from Luis Munoz Marin Intl to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Luis Munoz Marin Intl to Ontario in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on San Juan Luis Munoz Marin Intl Airport-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from San Juan Luis Munoz Marin Intl Airport-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on San Juan Luis Munoz Marin Intl Airport-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Juan Luis Munoz Marin Intl Airport-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Luis Munoz Marin Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Luis Munoz Marin Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Juan Luis Munoz Marin Intl Airport to Ontario

What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

Currently, October is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $172). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in February is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated February 13, 2026.
Read reviews from past customers who have flown United Airlines and American Airlines from San Juan Luis Munoz Marin Intl Airport to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,283 reviews

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,283 reviews
United Airlines
7.4
Good
9,283 reviews

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
American Airlines
7.2
Good
11,275 reviews
United Airlines
7.4
Good
9,283 reviews

Comfort

7.3

Boarding

7.7

Entertainment

7.1

Food

6.6

Overall

7.4

Crew

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

Related info for your journey

Find useful and relevant information for your journey from Luis Munoz Marin Intl to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from San Juan Luis Munoz Marin Intl?

    If you book a flight to Ontario from San Juan Luis Munoz Marin Intl, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from San Juan Luis Munoz Marin Intl to Ontario per day from 2 different airlines.

  • How long is the flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    Airlines like Southwest, Frontier, and American Airlines fly from San Juan Luis Munoz Marin Intl Airport to Ontario in about 12h 40m. The time it takes to get you to your destination can typically vary by up to 19h 57m. The distance from San Juan Luis Munoz Marin Intl Airport to Ontario is about 3334 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from San Juan Luis Munoz Marin Intl Airport to Ontario round-trip?

    Our cheapest airline available from San Juan Luis Munoz Marin Intl Airport to Ontario is American Airlines. Our recent data shows that you can find tickets from as low as $355 on this airline. An additional option worth looking into is United Airlines, starting at $367. Users have found that American Airlines is 21% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from San Juan Luis Munoz Marin Intl Airport to Ontario one-way?

    The cheapest airlines for a one-way flight from San Juan Luis Munoz Marin Intl Airport to Ontario are JetBlue ($171), American Airlines ($178), and Southwest ($192).

  • Can I find deals for flights from Luis Munoz Marin Intl to Ontario that include hotel bookings?

    Yes. In addition to deals on Luis Munoz Marin Intl to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Luis Munoz Marin Intl to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Luis Munoz Marin Intl to Ontario.

  • Can I find deals for business class flights from Luis Munoz Marin Intl to Ontario?

    Yes. Cheapflights offers flight deals from Luis Munoz Marin Intl to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    Currently, October is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $172). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in February is currently the most expensive (average of $295). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 2 airlines flying from Luis Munoz Marin Intl to Ontario

Discover the top 2 airlines that operate flights from Luis Munoz Marin Intl to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$355Average$600FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$367Average$520FlexibilityNo cancel feeOn-time69%

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